Eyepiece lens

Details Eyepiece lens Eyepiece lens

1996-08-06

1998-05-12

Pham, Hoa Q.

Optical: systems and elements

Lens

Eyepiece

359686, 359780, G02B 2500

Patent

active

057514950

ABSTRACT:
An eyepiece lens has an apparent field of no less than 40.degree., and minimizes eye relief error. The eye relief includes a distance between a lens surface closest to an eye point side in the eyepiece lens and an eye point. The eyepiece lens comprises an assembly of lens groups including, from the eye point, a first lens group G.sub.1 that includes one positive lens component, a second lens group G.sub.2 with positive refracting power that includes a cemented lens having a negative lens component and a positive lens component, a third lens group G.sub.3 with positive refracting power that includes a cemented lens having a positive lens component and a negative lens component, and a fourth lens group G.sub.4 that includes one negative lens component. The assembly of lenses is configured such that 1.4.ltoreq..vertline.R7/R4.vertline., wherein R4 is a radius of curvature of a cemented surface of the negative lens component and the positive lens component of the second lens group G2, and R7 is a radius of curvature of a cemented surface of the positive lens component and the negative lens component of the third lens group G.sub.3.

REFERENCES:
patent: 3638996 (1972-02-01), Klein
patent: 4249793 (1981-02-01), Uehara
patent: 4286844 (1981-09-01), Nagler
patent: 5227918 (1993-07-01), Suzuki et al.

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